How do I stop my cat putting his paw in my drinks?

My cat never fails to dip his dirty paws in my drinks and I can’t stop him he’s a naughty boy. I’ve litrally seen his paws stained purple from squash before now can’t even have a glass of water without him getting curious and dipping his paws in it to try it even though he has fresh water every day. What should I do?
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